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Red lights are red, yellow and green, because traffic officials, early systems engineers copied the railway code intended for monitoring systems for train control. The aim of the engineers of the railway in the development of this code is to avoid collisions often Fatal train, giving advance warning trains. Therefore, they do not take their task lightly in the choice of color for symbolic signals.
The red color of blood, proved a logical choice for the stop signal, like thousands of years, this color has prohibited danger. The color alone, the engineers of the railway reasoned, should give people cause to pause, to comply with the signal, and stop or suffer the consequences of death and destruction.
Engineers have used the method of trial and error in selecting the other colors. The first trial in the 1830s, that of choosing the green signal for caution and clear for the go signal, failed miserably. Clear as a choice for the go signal, varied slightly to highlight typical street lamps, or the brightness of sunlight, and thus could easily be confused with the signal from … after the fact.
This failure prompted the engineers of the railroad to change their color selections to red for stop, green for go, and yellow for caution. Traffic engineers, either lacking in ingenuity or work ethic, runs off with this system coding of color, and introduced the first electric traffic lights in Cleveland, Ohio in 1914. The first signal does not include the color yellow for caution, but was then added in a few years. Railroad engineers, not traffic engineers, should be credited for lives have been saved in the meantime, their coding system of red flags, yellow and green.
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Article Source: ArticlesBase.com – Why are Spotlights Red, Yellow and Green?
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